as peggy fox tells us, you're going to need one of those passes on your windshield to use them. >> reporter: you know the drive into this busy place, whether for work or play, could be a lot easier come saturday when the express lanes open up but you're going to need an ez pass. if you commute with three or more people on board, you can ride for free as long as you have a flex pass. anyone who has an ez pass or smart tag can use the new express lanes which run in both directions from springfield to the dulles access road. >> i think it's great. >> reporter: there are new glance and exit ramps exclusively for the express lanes. two go in and out of busy tysons corner. the tolls will vary. the more crowded, the more expensive in order to keep traffic flowing on the express lanes at or above 45 miles per hour. the tolls pay be as high as $10 each way unless you'll be carpooling or on a bus. >> flex, i think i can use the same one, right? >> reporter: no. you'll need a flex pass if you'll be hoving with three on board. then it's free. peggy fox, 9news now. >> turning our attention to health new